package com.theme.common.third.ueditor;

import com.baidu.ueditor.define.ActionMap;
import org.json.JSONArray;
import org.json.JSONObject;

import java.io.*;
import java.net.URISyntaxException;
import java.util.HashMap;
import java.util.Map;

/**
 * 配置管理器
 * @author hancong03@baidu.com
 *
 */
public final class ConfigManager {

    private final String rootPath;
    private final String originalPath;
    private final String contextPath;
    private static final String configFileName = "config.json";
    private String parentPath = null;
    private JSONObject jsonConfig = null;
    // 涂鸦上传filename定义
    private final static String SCRAWL_FILE_NAME = "scrawl";
    // 远程图片抓取filename定义
    private final static String REMOTE_FILE_NAME = "remote";

    /*
     * 通过一个给定的路径构建一个配置管理器， 该管理器要求地址路径所在目录下必须存在config.properties文件
     */
    private ConfigManager ( String rootPath, String contextPath, String uri ) throws FileNotFoundException, IOException {

        rootPath = rootPath.replace( "\\", "/" );

        this.rootPath = rootPath;
        this.contextPath = contextPath;

        if ( contextPath.length() > 0 ) {
            this.originalPath = this.rootPath + uri.substring( contextPath.length() );
        } else {
            this.originalPath = this.rootPath + uri;
        }

        this.initEnv();

    }

    /**
     * 配置管理器构造工厂
     * @param rootPath 服务器根路径
     * @param contextPath 服务器所在项目路径
     * @param uri 当前访问的uri
     * @return 配置管理器实例或者null
     */
    public static ConfigManager getInstance ( String rootPath, String contextPath, String uri ) {

        try {
            return new ConfigManager(rootPath, contextPath, uri);
        } catch ( Exception e ) {
            return null;
        }

    }

    // 验证配置文件加载是否正确
    public boolean valid () {
        return this.jsonConfig != null;
    }

    public JSONObject getAllConfig () {

        return this.jsonConfig;

    }

    public Map<String, Object> getConfig ( int type ) {

        Map<String, Object> conf = new HashMap<String, Object>();
        String savePath = null;

        switch ( type ) {

            case ActionMap.UPLOAD_FILE:
                conf.put( "isBase64", "false" );
                conf.put( "maxSize", this.jsonConfig.getLong( "fileMaxSize" ) );
                conf.put( "allowFiles", this.getArray( "fileAllowFiles" ) );
                conf.put( "fieldName", this.jsonConfig.getString( "fileFieldName" ) );
                savePath = this.jsonConfig.getString( "filePathFormat" );
                break;

            case ActionMap.UPLOAD_IMAGE:
                conf.put( "isBase64", "false" );
                conf.put( "maxSize", this.jsonConfig.getLong( "imageMaxSize" ) );
                conf.put( "allowFiles", this.getArray( "imageAllowFiles" ) );
                conf.put( "fieldName", this.jsonConfig.getString( "imageFieldName" ) );
                savePath = this.jsonConfig.getString( "imagePathFormat" );
                break;

            case ActionMap.UPLOAD_VIDEO:
                conf.put( "maxSize", this.jsonConfig.getLong( "videoMaxSize" ) );
                conf.put( "allowFiles", this.getArray( "videoAllowFiles" ) );
                conf.put( "fieldName", this.jsonConfig.getString( "videoFieldName" ) );
                savePath = this.jsonConfig.getString( "videoPathFormat" );
                break;

            case ActionMap.UPLOAD_SCRAWL:
                conf.put( "filename", ConfigManager.SCRAWL_FILE_NAME );
                conf.put( "maxSize", this.jsonConfig.getLong( "scrawlMaxSize" ) );
                conf.put( "fieldName", this.jsonConfig.getString( "scrawlFieldName" ) );
                conf.put( "isBase64", "true" );
                savePath = this.jsonConfig.getString( "scrawlPathFormat" );
                break;

            case ActionMap.CATCH_IMAGE:
                conf.put( "filename", ConfigManager.REMOTE_FILE_NAME );
                conf.put( "filter", this.getArray( "catcherLocalDomain" ) );
                conf.put( "maxSize", this.jsonConfig.getLong( "catcherMaxSize" ) );
                conf.put( "allowFiles", this.getArray( "catcherAllowFiles" ) );
                conf.put( "fieldName", this.jsonConfig.getString( "catcherFieldName" ) + "[]" );
                savePath = this.jsonConfig.getString( "catcherPathFormat" );
                break;

            case ActionMap.LIST_IMAGE:
                conf.put( "allowFiles", this.getArray( "imageManagerAllowFiles" ) );
                conf.put( "dir", this.jsonConfig.getString( "imageManagerListPath" ) );
                conf.put( "count", this.jsonConfig.getInt( "imageManagerListSize" ) );
                break;

            case ActionMap.LIST_FILE:
                conf.put( "allowFiles", this.getArray( "fileManagerAllowFiles" ) );
                conf.put( "dir", this.jsonConfig.getString( "fileManagerListPath" ) );
                conf.put( "count", this.jsonConfig.getInt( "fileManagerListSize" ) );
                break;

        }

        conf.put( "savePath", savePath );
        conf.put( "rootPath", this.rootPath );

        return conf;

    }

    private void initEnv () throws FileNotFoundException, IOException {

        File file = new File( this.originalPath );

        if ( !file.isAbsolute() ) {
            file = new File( file.getAbsolutePath() );
        }

        this.parentPath = file.getParent();

        String configContent = this.readFile( this.getConfigPath() );

        try{
            JSONObject jsonConfig = new JSONObject( configContent );
            this.jsonConfig = jsonConfig;
        } catch ( Exception e ) {
            this.jsonConfig = null;
        }

    }


    private String getConfigPath () {
        //return this.parentPath + File.separator + ConfigManager.configFileName;
        try {
            //获取classpath下的config.json路径
            return this.getClass().getClassLoader().getResource("config.json").toURI().getPath();
        } catch (URISyntaxException e) {
            return null;
        }
    }

    private String[] getArray ( String key ) {

        JSONArray jsonArray = this.jsonConfig.getJSONArray( key );
        String[] result = new String[ jsonArray.length() ];

        for ( int i = 0, len = jsonArray.length(); i < len; i++ ) {
            result[i] = jsonArray.getString( i );
        }

        return result;

    }

    private String readFile ( String path ) throws IOException {

        StringBuilder builder = new StringBuilder();

        try {

            InputStreamReader reader = new InputStreamReader( new FileInputStream( path ), "UTF-8" );
            BufferedReader bfReader = new BufferedReader( reader );

            String tmpContent = null;

            while ( ( tmpContent = bfReader.readLine() ) != null ) {
                builder.append( tmpContent );
            }

            bfReader.close();

        } catch ( UnsupportedEncodingException e ) {
            // 忽略
        }

        return this.filter( builder.toString() );

    }

    // 过滤输入字符串, 剔除多行注释以及替换掉反斜杠
    private String filter ( String input ) {

        return input.replaceAll( "/\\*[\\s\\S]*?\\*/", "" );

    }

}
